Resultant Forces

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14 Terms

1
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What is a resultant force?

The single force that has the same effect as all the original forces acting on an object combined.

2
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What happens when multiple forces act on an object?

They can be added or subtracted to give a resultant force in one direction.

3
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What is a free body diagram?

A diagram showing all the forces acting on an object, including their directions and relative magnitudes.

4
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What do arrows on a free body diagram show?

The direction and relative magnitude of the forces acting on the object.

5
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What two forces act on a skydiver during free fall?

Weight (downwards) and drag (upwards).

6
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How do you find the resultant force from multiple forces?

Add forces in the same direction and subtract forces in opposite directions.

7
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In which direction is the resultant force on a skydiver during free fall?

Downwards (if weight > drag).

8
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What is meant by the term 'single force'?

A force that replaces all others acting at a point and has the same overall effect.

9
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What does it mean if forces are along the same line?

They are parallel, and their effects can be added/subtracted directly.

10
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In a free body diagram, what is the first step to calculate the resultant force?

Separate the horizontal and vertical forces.

11
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In the example, if the horizontal forces are 1200 N (right) and 1000 N (left), what is the horizontal resultant force?

200 N to the right.

12
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If vertical forces are 1500 N (up) and 1500 N (down), what is the vertical resultant force?

0 N — balanced forces.

13
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Why is the resultant force important?

It determines the motion or change in motion of an object.

14
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What is the typical case of resultant force in a falling object?

The difference between weight (down) and air resistance (up).